Finding the Fourth Proportional to 2,003.32, 2,764.62 and 1,217.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.32 : 2,764.62 = 1,217.20 : x
2. Step 2: Convert to fraction form
   2,003.32/2,764.62 = 1,217.20/x
3. Step 3: Cross multiply
   2,003.32x = 2,764.62 × 1,217.20
4. Step 4: Simplify right side
   2,003.32x = 3,365,095.46
5. Step 5: Solve for x
   x = 3,365,095.46/2,003.32
6. Step 6: Final answer
   x = 1,679.76